SHOULDER SCAPULAR REGION 



5 1 



Dissection. The limb should now be placed on its posterior aspect, and 

 the posterior circumflex artery of the humerus and the axillary nerve 

 should be traced backwards through the quadrilateral space. The bound- 

 aries of the space should be defined and 'cleaned at the same time. 



Quadrilateral and Triangular Spaces. The quadrilateral 

 space is purely the result of dissection ; it has no real 



Cot 



Descending branch of transverse cervical artery 

 Suprascapular nerve and transverse 

 , scapular artery 



jracoid process 



Capsule of shoulder-joint 



Tendon of supraspinatus 



Tendon of infra- 

 spinatus 



Subscapular artery 



Descending branch 

 Circumflex scapulse artery 



Posterior circumflex artery and 

 axillary nerve 



Nerve to teres. -minor 



FIG. 21. Dissection of the Posterior Scapular Region. 



existence until the parts are artificially separated from each 

 other. When viewed from the front, the boundaries will 

 be seen to be formed (a) laterally, by the upper part of the 

 body of the humerus ; (b) medially, by the long head of the 

 triceps ; (c] above, by the lower margin of the subscapularis ; 

 (d) and below, by the upper border of the teres major. When 

 viewed from behind, the upper boundary of the quadrilateral 

 space will be seen to be formed by the teres minor ; the 

 i 4 a 



